I don’t recall that on my C2. Much of info is missing. What’s your mobile operator? Do you have 4G connection? Is VoLTE registered? Can you try another mobile operator?
That is Windows bug probably triggered by SFOS.
How are other WiFi spots working?
Every OS has it’s shortcomings. If you want cosy you can chose Andy’s golden cage. If you want more choice you’ll need to deal with workarounds.